With many excellent preperties,field emission display(FED) is considered as one of the most promising flat panel displays(FPD).It is useful to analyze patents for studying the development trends of FED.After selected from the patent database of European Patent Office,the main FED patents were analyzed and sorted.The FED development status and trends in the United States,Japan,South Korea,China,and other countries were discussed.Existing problems and development trends of FED patent in China were mainly disc...